Q201
Open questionProps are withdrawn by
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Mining Engineering · all questionsMine Supports and Strata Control
Mine Supports and Strata Control
practice.
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320
Questions
11/16
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Q202
Open questionThe depression of ground surface and structures are called
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Q203
Open questionInstrumentation helps in understanding the behaviour of roof by measuring . . . . . . . .
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Q204
Open questionThe external pump, serving number of props from one central site, connected to prop by pipes called
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Q205
Open questionIn cog, sleeper piece should be in the shape of
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Q206
Open questionIn pressure arch theory, the bending forces whose magnitude increases with . . . . . . . . excavation.
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Q207
Open questionIn 3 m of immediate roof of an coal in u/g, bottom 2 m layer of sand stone of fine grained layer, has an RMR of 45, while upper 1 m of coarse grained sand stone has RMR of 30. What will be the over all RMR of the immediate roof?
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Q208
Open questionHydraulic prop is an . . . . . . . . support, where as shot creting is a . . . . . . . . support.
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Q209
Open questionThe phenomina of lift in up of floor, if the floor is week called
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Q210
Open questionA prop which is set that the axis is inbetween the vertical and the normal to the seam called
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Q211
Open questionRQD signifies
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Q212
Open questionTape extensometers are used to measure
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Q213
Open questionIf R is the RMR, B is gallery span in meters, D is the rock density in t/m3, what will be the empirieal formula for rock load in ton/m3?
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Q214
Open questionThe type of supports which needs less man power than conventional supports.
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Q215
Open questionIf the width of excavation increases, the span of pressure arch . . . . . . . .
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Q216
Open questionSal props are available in lengths upto
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Q217
Open questionProximate analysis of coal gives the percentage of
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Q218
Open questionThe hole should terminate . . . . . . . . m below, if immeidate roof is shale.
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Q219
Open questionStoring space required for roof bolts are
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Q220
Open questionFor starting a mine, the required is
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